Related Experiment Video

Updated: Aug 19, 2026

Nanomechanics of Drug-target Interactions and Antibacterial Resistance Detection
11:56

Nanomechanics of Drug-target Interactions and Antibacterial Resistance Detection

Published on: October 25, 2013

Prevention of drug access to bacterial targets: permeability barriers and active efflux

H Nikaido1

  • 1Department of Molecular and Cell Biology, University of California, Berkeley 94720-3206.

Science (New York, N.Y.)
|April 15, 1994
PubMed

Insights

Intrinsically antibiotic-resistant bacteria, with low-permeability membranes and efflux pumps, cause hospital infections. These non-specific resistance mechanisms are increasingly important as specific drug resistance is overcome.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Infectious Diseases

Background:

  • Bacterial intrinsic antibiotic resistance is a significant challenge in healthcare settings.
  • Low-permeability membrane barriers and energy-driven efflux pumps are key mechanisms conferring resistance.
  • Hospital-acquired infections are often caused by intrinsically resistant bacteria.

Purpose of the Study:

  • To investigate the role of membrane permeability and efflux systems in bacterial antibiotic resistance.
  • To highlight the increasing clinical significance of non-specific resistance mechanisms.

Main Methods:

  • Analysis of bacterial membrane properties and their impact on antibiotic susceptibility.
  • Investigation of energy-dependent efflux systems and their substrate specificity.
  • Case study focusing on Pseudomonas aeruginosa as a model opportunistic pathogen.

Main Results:

  • Low-permeability membranes confer intrinsic resistance to various antibiotics.
  • Broad-substrate efflux systems, similar to mammalian multidrug resistance pumps, are crucial for resistance.
  • Pseudomonas aeruginosa utilizes such systems for intrinsic resistance.

Conclusions:

  • Non-specific resistance mechanisms, including permeability barriers and multidrug efflux, are critical in the clinical setting.
  • As specific antibiotic resistance is addressed, these less specific mechanisms will become more prominent.
  • Understanding these pathways is vital for developing new strategies against hospital-acquired infections.

More Related Videos

Visualization of Bacterial Resistance using Fluorescent Antibiotic Probes08:23

Visualization of Bacterial Resistance using Fluorescent Antibiotic Probes

Published on: March 2, 2020

Characterizing Multidrug Efflux Systems in Acinetobacter baumannii Using an Efflux-Deficient Bacterial Strain and a Single-Copy Gene Expression System05:06

Characterizing Multidrug Efflux Systems in Acinetobacter baumannii Using an Efflux-Deficient Bacterial Strain and a Single-Copy Gene Expression System

Published on: January 5, 2024

Related Concept Videos

Drug Elimination by Renal Route: Tubular Secretion01:15

Drug Elimination by Renal Route: Tubular Secretion

Once the process of glomerular filtration is completed, blood carrying unfiltered drug molecules traverses through efferent arterioles and makes its way into the peritubular capillaries in the proximal tubule. A variety of carriers play a pivotal role in actively secreting drugs from these peritubular capillaries into the tubular fluid. The organic anion transporter transfers acidic drugs, against an electrochemical gradient, from the peritubular capillaries into the renal tubule cells and...
Cellular Membranes and Drug Transport01:24

Cellular Membranes and Drug Transport

Drugs must traverse multiple biological barriers, such as multi-layered skin, single-layered intestinal epithelium, and the plasma membrane, to reach their target sites within the body. The plasma membrane, a highly structured composite of phospholipids, carbohydrates, and proteins, is the cell's protective boundary, facilitating selective substance exchange.
Phospholipids arrange themselves into a bilayer, with hydrophilic heads oriented outward and hydrophobic tails facing inward.
Mechanisms of Drug Absorption: Paracellular, Transcellular, and Vesicular Transport01:23

Mechanisms of Drug Absorption: Paracellular, Transcellular, and Vesicular Transport

Drugs need to permeate cell membranes to reach their target sites after administration. Orally administered drugs must transcend intestinal epithelial membrane barriers to infiltrate the systemic circulation. Drugs with a molecular weight of less than 500 Daltons diffuse through gaps between neighboring cells, called paracellular pathways.
However, most drugs use the transcellular route, traversing directly through the cell membranes via two mechanisms: passive and active transport. Passive...
Carrier-Mediated Transport01:06

Carrier-Mediated Transport

Carrier-mediated transport is a pivotal process in drug absorption, particularly for lipid-insoluble drugs, and encompasses facilitated diffusion and active transport. Facilitated diffusion allows drugs to move along their concentration gradient without energy expenditure, while active transport utilizes ATP to drive drug movement against this gradient.
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...
Bioavailability Enhancement: Drug Permeability Enhancement01:27

Bioavailability Enhancement: Drug Permeability Enhancement

After oral administration, poor permeability often limits the rate at which drugs are absorbed through the intestinal epithelium. Enhancing drug permeability is crucial for effective therapy, and several strategies have been developed to overcome this challenge.One effective strategy involves the use of lipid-based formulations. These formulations enhance dissolution and solubility, targeting physiological mechanisms to increase drug absorption. This includes stimulating bile salt secretion,...
Development of Antibiotic Resistance01:30

Development of Antibiotic Resistance

Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...